Feed screw device

Abstract

A ring-like lubricant supply device 6 is fitted into a recess 4 of a nut member 2. The lubricant supply device 6 contains a lubricant and is formed in an outer peripheral surface with notches 7. Tubular members 8 each having an outer diameter larger than the diameter of the notch 7 are inserted into the notches, pushing and widening the notches 7 in a circumferential direction. One end of the tubular member 8 is fitted into a recess 9 b of a retaining ring 9 and the retaining ring 9 is fixed to a nut member 2.

What is claimed is:  
     
       1. A feed screw device comprising: 
       a screw shaft;  
       a nut member threadably engaging an outer periphery surface of the screw shaft;  
       a lubricant supply device having at least two insertion holes formed in an outer periphery side thereof, said at least two insertion holes formed at a predetermined interval in the circumferential direction; and  
       a retaining ring which retains said lubricant supply device, said retaining ring having at least two projections formed thereon at a predetermined interval and disposed so as to be respectively received in said at least two insertion holes,  
       wherein the predetermined interval of said at least two projections is set slightly smaller than the predetermined interval of said at least two insertion holes.  
     
     
       2. The feed screw device according to  claim 1 , wherein said nut member includes a recess portion, and wherein said retaining ring retains said lubricant supply device within said recess portion. 
     
     
       3. The feed screw device according to  claim 1 , wherein said lubricant supply device comprises a cut part disposed at a position along the circumference of said lubricant supply device. 
     
     
       4. The feed screw device according to  claim 1 , wherein said lubricant supply device comprises a plurality of lip parts projecting toward said screw shaft and which come in sliding contact with the outer peripheral surface of said screw shaft. 
     
     
       5. The feed screw device according to  claim 1 , wherein said retaining ring is fixedly secured to said nut member, and said at least two projections formed on said retaining ring prevent said lubricant supply device from rotating with said screw shaft. 
     
     
       6. The feed screw device according to  claim 1 , further including a projection formed on an inner peripheral surface of said lubricant supply device which engages with said screw shaft. 
     
     
       7. The feed screw device according to  claim 6 , wherein said projection forms a spiral configuration, said spiral configuration fits into a thread groove of said screw shaft. 
     
     
       8. The feed screw device according to  claim 1 , wherein said lubricant supply device contacts the outer peripheral surface of said screw shaft. 
     
     
       9. The feed screw device according to  claim 8 , wherein said retaining ring is fixedly secured to said nut member by a screw. 
     
     
       10. The feed screw device according to  claim 1 , wherein at least a portion of said lubricant supply device facing said screw shaft is made of one of rubber and synthetic resin.